Modify the Chrome Linux zygote to support a nacl_helper executable,

chrome/app/chrome_main.cc

Index: chrome/app/chrome_main.cc
diff --git a/chrome/app/chrome_main.cc b/chrome/app/chrome_main.cc
index bc8b594014fa5f6c5c954d1c1bfc66a6251db04e..f47a28bc91229dbd668e9ca21d064906a007006a 100644
--- a/chrome/app/chrome_main.cc
+++ b/chrome/app/chrome_main.cc
@@ -47,6 +47,11 @@
 #include "ui/base/ui_base_paths.h"
 #include "ui/base/ui_base_switches.h"
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#include "chrome/common/nacl_fork_delegate_linux.h"
+#include "content/common/zygote_fork_delegate_linux.h"
+#endif
+
 #if defined(OS_WIN)
 #include <algorithm>
 #include <malloc.h>
@@ -112,7 +117,10 @@ extern int WorkerMain(const MainFunctionParams&);
 extern int NaClMain(const MainFunctionParams&);
 extern int UtilityMain(const MainFunctionParams&);
 extern int ProfileImportMain(const MainFunctionParams&);
-extern int ZygoteMain(const MainFunctionParams&);
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
+extern int ZygoteMain(const MainFunctionParams&,
+                      ZygoteForkDelegate* forkdelegate);
+#endif
 #if defined(_WIN64)
 extern int NaClBrokerMain(const MainFunctionParams&);
 #endif
@@ -450,7 +458,7 @@ int RunZygote(const MainFunctionParams& main_function_params) {
     media::InitializeMediaLibrary(media_path);
 
   // This function call can return multiple times, once per fork().
-  if (!ZygoteMain(main_function_params))
+  if (!ZygoteMain(main_function_params, new NaClForkDelegate()))
     return 1;
 
   // Zygote::HandleForkRequest may have reallocated the command